You may need to reach out to the local tournament director, registrar, or the assigned regional commissioners for a specific tournament. Finding the contact information is easy.
You start with the Tournament lists on the NAGVA website: https://nagva.org/tournaments. Navigate to the tournament you are interested in.
On each tournament details page, you will find the local tournament's contacts on the upper-left side of the page. Each of the names will have a link to start an e-mail with them.